Understanding Bone Marrow Biopsy

A bone marrow biopsy (often performed alongside a bone marrow aspiration) is a common procedure used to evaluate the health of your bone marrow and blood-forming cells. This guide explains what it is, why it may be recommended, how to prepare, what happens during the procedure, and how to care for yourself afterward.

What Is a Bone Marrow Biopsy?

Bone marrow is the soft, spongy tissue inside certain bones (most commonly the hip bone) where your body makes red blood cells, white blood cells, and platelets.

There are usually two related procedures:

• Bone marrow aspiration: A needle draws a small sample of the liquid portion of the marrow.
• Bone marrow biopsy: A slightly larger hollow needle removes a small core (cylinder) of solid marrow tissue.

The samples are examined under a microscope by a pathologist and may undergo additional specialized tests (flow cytometry, cytogenetics, molecular studies, etc.).

Why Might I Need a Bone Marrow Biopsy?

Your doctor may recommend the procedure when blood tests are abnormal or do not give enough information. Common reasons include:

• Unexplained anemia or abnormal blood cell counts
• Suspected blood cancers such as leukemia, lymphoma, or multiple myeloma
• Myelodysplastic syndromes or myeloproliferative disorders
• Checking whether a cancer has spread to the bone marrow
• Evaluating iron stores or certain infections
• Monitoring response to treatment or investigating unexplained fever

How Do I Prepare?

Preparation is usually straightforward. Your care team will give specific instructions, which may include:

• Medications: Tell your provider about all medicines and supplements. You may need to stop blood thinners (aspirin, warfarin, etc.) for several days beforehand.
• Fasting: If you will receive sedation, you may be asked not to eat or drink for several hours before the procedure.
• Transportation: Arrange for someone to drive you home if sedation is used.
• Allergies & history: Inform the team of any allergies (especially to local anesthetics or antiseptics) and any bleeding problems.

How Is the Procedure Done?

The procedure is usually performed as an outpatient and takes about 20–30 minutes (longer if sedation is used). The most common site is the back of the hip bone (posterior iliac crest).

Typical steps:

• You lie on your side or stomach.
• The skin is cleaned, and local anesthetic is injected to numb the area (and the surface of the bone).
• A small incision may be made.
• Aspiration is performed first: a needle enters the marrow and liquid is withdrawn (brief pressure or discomfort is common).
• Biopsy follows: a larger hollow needle is used to remove a core of solid marrow tissue (you may feel pressure or a twisting sensation).
• Pressure is applied to stop bleeding, and a bandage is placed over the site.

Most people feel pressure rather than sharp pain once the area is properly numbed. Sedation can be offered for additional comfort.

What Is the Aftercare?

After the procedure:

• You will be asked to lie still for 10–15 minutes (or longer if sedated), so bleeding is controlled.
• Keep the bandage clean and dry for at least 24 hours.
• Mild soreness at the site is common and may last a few days to a week. Over-the-counter pain relief (as approved by your doctor) can help.
• Avoid strenuous activity and heavy lifting for 24–48 hours (or as directed).
• Results typically take several days to a couple of weeks, depending on the tests ordered.

When to Call Your Doctor

Contact your healthcare provider if you experience:

• Fever
• Increasing pain, redness, swelling, or drainage at the site
• Bleeding that does not stop with gentle pressure

Important Note

This guide provides general educational information only. It is not a substitute for professional medical advice, diagnosis, or treatment. Your specific situation determines the details of preparation, the procedure, and aftercare. Always discuss any concerns with your doctor and follow the personalized instructions you receive from your care team.